/// <summary> /// 旋转Polygon2d /// </summary> /// <returns></returns> public static Polygon2d Rotate(this Polygon2d polygon2d, Vector2d origin, double angle) { if (angle == 0) { return(polygon2d); } Matrix2d rotationTransform = new Matrix2d(angle); Polygon2d _polygon2D = new Polygon2d(polygon2d);// 避免自身图形被修改 return(_polygon2D.Rotate(rotationTransform, origin)); }
// exports svg w/ different containments of point set (created by slicing mesh) public static void containment_demo_svg() { DMesh3 mesh = TestUtil.LoadTestInputMesh("bunny_solid.obj"); MeshTransforms.Scale(mesh, 4); AxisAlignedBox3d meshBounds = mesh.CachedBounds; Vector3d origin = meshBounds.Center; origin -= 0.2 * meshBounds.Height * Vector3d.AxisY; Frame3f plane = new Frame3f(origin, new Vector3d(1, 3, 0).Normalized); MeshPlaneCut cut = new MeshPlaneCut(mesh, plane.Origin, plane.Z); cut.Cut(); AxisAlignedBox2d polyBounds = AxisAlignedBox2d.Empty; List <Polygon2d> polys = new List <Polygon2d>(); foreach (EdgeLoop loop in cut.CutLoops) { Polygon2d poly = new Polygon2d(); foreach (int vid in loop.Vertices) { poly.AppendVertex(mesh.GetVertex(vid).xz); } poly.Rotate(new Matrix2d(90, true), Vector2d.Zero); polys.Add(poly); polyBounds.Contain(poly.Bounds); } SVGWriter svg = new SVGWriter(); var polyStyle = SVGWriter.Style.Outline("red", 1.0f); var contStyle = SVGWriter.Style.Outline("black", 1.0f); for (int k = 0; k < 3; ++k) { double shift = (k == 2) ? 1.4f : 1.1f; Vector2d tx = (k - 1) * (polyBounds.Width * shift) * Vector2d.AxisX; List <Vector2d> pts = new List <Vector2d>(); foreach (Polygon2d poly in polys) { var p2 = new Polygon2d(poly).Translate(tx); pts.AddRange(p2.Vertices); svg.AddPolygon(p2, polyStyle); } if (k == 0) { ConvexHull2 hull = new ConvexHull2(pts, 0.001, QueryNumberType.QT_DOUBLE); svg.AddPolygon(hull.GetHullPolygon(), contStyle); } else if (k == 1) { ContMinBox2 contbox = new ContMinBox2(pts, 0.001, QueryNumberType.QT_DOUBLE, false); svg.AddPolygon(new Polygon2d(contbox.MinBox.ComputeVertices()), contStyle); } else if (k == 2) { ContMinCircle2 contcirc = new ContMinCircle2(pts); svg.AddCircle(contcirc.Result, contStyle); } } svg.Write(TestUtil.GetTestOutputPath("contain_demos.svg")); }